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OTHER FINANCIAL LIABILITIES (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Current liabilities $ 12,200 $ 24,881
Non-current liabilities 2,617 6,679
Total hedge derivatives 14,817 31,560
Interest Rate Swap [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Current liabilities 1,189 2,148
Non-current liabilities
Total hedge derivatives 1,189 2,148
Interest Rate Derivative Contracts [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Current liabilities 8,919 9,578
Non-current liabilities 2,617 6,679
Total hedge derivatives 11,536 16,257
Foreign Forward Instrument [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Current liabilities 2,092 13,155
Non-current liabilities
Total hedge derivatives $ 2,092 $ 13,155